<!DOCTYPE html>
<html>
	<head><!--头部标记-->
		<meta charset="utf-8">
		<title>课程网站</title>
	</head>
	<body background="1.jpg">
<form align="center"><!--创建form表单-->
	<input type="text">
	<input type="submit" value="搜索"/>
</form>
<ul>
	<li><a href="tableA.html" target="content_table">A班</a></li>
	<li><a href="tableB.html" target="content_table">B班</a></li>
</ul>
<iframe  name="content_table"  frameborder="0"  width="600"  height="600"  scrolling="no" src="table.html"></iframe>
	</body>
</html>